] "We believe that pufferfish acquire poison by eating
] poisonous food, such as starfish and shellfish, rather
] than producing it themselves. So we fed them nonpoisonous
] food," Arakawa said.
]
] He and his colleagues kept about 5,000 fugu on a strict
] regime of mackerel and other nonpoisonous food at seven
] locations along Japan's west coast from 2001 to 2003.

But where is the fun in that?

Salon.com Technology | Scientists develop blowfish minus poison